Audio Analyzer

1. Drop one audio file into the drop zone or click browse files.
2. Wait while the file is decoded and the analysis workspace appears.
3. Play the file, then click Waveform or Spectrogram to move to a position.
4. Click a clipping event or silent interval to move the player to its timestamp.

Read the Waveform and Spectrogram

The Waveform shows amplitude across time. The Spectrogram shows frequency energy across time, with brighter areas representing more energy. Click either view to move the player.

Input: one local audio file
Output: Waveform and Spectrogram
         BPM estimate and Key estimate
         Integrated loudness, peaks, clipping, silence, phase

The Spectrogram uses a 2048-sample window and 512-sample hop. Its vertical axis runs from 0 Hz to the Nyquist frequency. Each view has an Export PNG button.

Read BPM, key, loudness, and peaks

BPM estimate searches 40 to 220 BPM, then normalizes the displayed result into 70 to 180 BPM by doubling or halving it. Syncopated or sparse material can produce a half-tempo or double-tempo multiple. Read the confidence value and method note with it.

Key estimate compares an average chroma vector with Krumhansl-Kessler major and minor key profiles. Atonal, noise-heavy, heavily percussive, or modulating material can reduce its reliability.

Integrated loudness is reported in LUFS with gated K-weighting. RMS level, Sample peak, and True peak use separate measurements. Loudness range is the difference between P95 and P10 gated short-term loudness. Dynamic range is crest factor, peak minus RMS. True peak uses 4x oversampling.

Find clipping, silence, and phase issues

Clipping events group consecutive samples at or above -0.3 dBFS. Silent intervals mark signal below -50 dBFS when it stays there for at least 300 ms. Click an event row to move the player to its start time.

Stereo phase correlation appears for audio with at least two channels. Its scale runs from +1 for identical channels to -1 for fully inverted channels. Mono input hides the phase panel. Values below 0 can cancel when summed to mono.

Export reports and limits

Use Export JSON report for structured data or Export text report for a readable summary. Export PNG appears for Waveform and Spectrogram. The event lists render the first 200 events in each category; the text report includes the first 50.

The file picker accepts audio/*. The drop zone lists MP3, WAV, FLAC, AAC, OGG, and more, and accepts one file at a time. If decoding fails, the page shows an alert beginning Could not decode this audio file. The analyzer does not re-encode, trim, normalize, or alter the source.

Use the results during a review

• Review the Waveform and event timestamps to find clipped sections in a mix.
• Compare BPM estimate and Key estimate with a backing track before arranging.
• Open Silent intervals and jump to each timestamp when checking a recording.
• Read True peak, Integrated loudness, and Stereo phase correlation before a mono check.

When to use Audio Analyze Tools

Open Audio Analyze Tools when you need measurements from an audio file. Audio Analyzer combines visual views, tempo and key estimates, level readings, event detection, and stereo checks in one report.

Frequently asked questions